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TRANSDUCERS AND CONE ANGLES
The sound waves from the transducer
spread
out into the water in a
cone
shaped
beam. This looks much like the beam from a
flashlight.
The
angle
between the outside
edges
of the cone is the cone
angle.
Eagle
offers a choice of transducers with either an 8 or
20
degree
cone
angle. Typically,
wide cone
angle
transducers
(20 degrees)
are ideal
for
operating
in shallow to medium water
depths.
The 20
degree
cone
angle
allows
you
to see more of the underwater world. In 15 feet of
water the 20
degree
cone covers an area about six feet across. The 8
degree
transducer
covers
only
about a two foot circle.
The
20
degree
transducer is almost
always
the best to use in fresh
water,
the 8
degree mostly
in
salt water.
In a
deep
water
environment,
(300
feet
-
fresh
water,
100 feet
-
salt
water)
the narrow cone
angle
is
more desirable. Since the
sound
energy
is concentrated in a smaller
area,
it can
penetrate
to much
deeper depths.
50'
100'
150'
200'
8°at3db
CHART SPEED
At
power
on,
the chart
speed
scrolls at a
preset speed.
To
change
the
speed, press
the CHART SPEED
key.
The word "CHART"
will flash on
the
right
side of the
display.
A vertical bar will also
appear
on the left
side of the screen. This indicates the current chart
speed.
Next, press
the
up
arrow
key
if
you
wish to increase the chart
speed.
Press the
down arrow
key
to decrease it. When the chart reaches the desired
speed,
release the
key.
There are five
steps
of chart
speed.
When the
chart
speed
reaches its maximum or minimum
level,
the unit
will sound
a tone.
To view the chart
speed
without
changing it, press
the CHART SPEED
key.
The chart
speed
bar
will
appear
for
eight
seconds.
At times it is desirable to
stop
or "freeze" the
display
to examine an
echo before it scrolls off the screen.
Pressing
the SENS. and
CHART
SPEED
keys
at the same time will freeze the
display.
Press the SENS.
and CHART SPEED
keys again
to start the
display moving
at the
last
chart
speed selling.
If the
digital
sonar is
on,
the bottom
depth
will still
be
displayed.
The
digital
does not
stop
when the chart is in the "freeze"
mode.
20 9
CS
____ n
-
LI
AUTO
CHART
AN
311
CL'
rn
2O°at3.-
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11


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